Ball joint unit

A ball joint unit, the unit comprising:

• a ball member;
• a plurality of lubricant reception recesses formed on a surface of the ball member;
• a rod member connected to a first element to be integrally formed with the ball member;
• and
• a retainer connected to a second element and formed with a spherical ball member receptor corresponding in shape to the ball member;
• wherein a lubricant is accommodated and coated in an interior of the lubricant reception recesses and a surface of the ball member;
• wherein each lubricant reception recess has a predetermined amount of the lubricant accommodated therein and the ball joint unit is configured such that the accommodated lubricant in the lubricant reception recess is transferred to the surface of the ball member;
• wherein an entire inner surface of the ball member receptor is spherical;
• wherein the ball member is flatly-formed at a distal end facing the spherical inner surface of the ball member receptor to inhibit contact with the spherical inner surface of the ball member receptor;
• wherein the lubricant is accommodated in a space formed between the distal end of the ball member and the inner circumferential surface of the ball member receptor;
• wherein a depth of each lubricant reception recess in a longitudinal direction is different from that of the other lubricant reception recesses, while a depth of each lubricant reception recess in a latitudinal direction is identical to that of the other lubricant reception recesses, and
• wherein each lubricant reception recess is flat at a floor surface, the floor surface is formed in parallel with an axial direction of the rod member, and the floor surface of each lubricant reception recess is aligned on a straight line with the axial direction of the rod member.